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Note 10 - Guarantees (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
(in thousands)
  
2016
   
2015
   
2014
 
Beginning balance
   $
4,886
     $
5,848
     $
4,673
  
Warranty accruals
    
6,088
      
6,747
      
6,176
  
Warranty payments
    
(6,624
 )    
(7,709
 )    
(5,001
 )
Ending balance
   $
4,350
     $
4,886
     $
5,848